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ISurfacePoint_DG Interface

GetLocation

GetEntity

GetElement

GetElementDimension

GetElementType

GetElementType1

GetParentElement

GetParentElementCount

GetNormalCount

GetNormal

GetParameter

Represents a point on surface of an entity

In this update ISurfacePoint_DG can be obtained via IPick_DG.GetSurfacePointAt() call

PointDg GetLocation()

Returns 3D coordinates of the point

IEntity_DG GetEntity()

Returns the entity, on surface of which this point is geometrically located or null if the point is outside of any surface

Object GetElement()

Let int dim = GetElementDimension()

If GetEntity().GetGeometryType() returns "BRep", the actual type of the interface returned by this method is:
IBRepVertex_DG if dim = 0
IBRepEdge_DG if dim = 1
IBRepFace_DG if dim = 2

If GetEntity().GetGeometryType() returns "Mesh", the actual type of the interface returned by this method is:
IVertex_DG if dim = 0
IVertexSegment_DG if dim = 1
ISimplex_DG if dim = 2

Example:

ISurfacePoint_DG iSurfPoint = m_iPick.GetSurfacePointAt(x, y);
IEntity_DG iEntity = iSurfPoint.GetEntity();
string strGeometryType = iEntity.GetGeometryType();
int dim = iSurfPoint.GetElementDimension();

if (strGeometryType == "BRep")
{
    if (dim == 0)
    {
        IBRepVertex_DG iVertex = iSurfPoint.GetElement() as IBRepVertex_DG;
        PointDg pt = iVertex.GetPosition1();
    }
    else if (dim == 1)
    {
        IBRepEdge_DG iEdge = iSurfPoint.GetElement() as IBRepEdge_DG;
        PointDg pt = iEdge.GetPointRatio(0.5);
    }
    else if (dim == 2)
    {
        IBRepFace_DG iFace = iSurfPoint.GetElement() as IBRepFace_DG;
        PointDg pt = iFace.GetPointAtRatios(new Dg_2D(0.5, 0.5));
     }
}
else if (strGeometryType == "Mesh")
{
    double xx, yy, zz;
    if (dim == 0)
    {
        IVertex_DG iVertex = iSurfPoint.GetElement() as IVertex_DG;
        iVertex.GetVertexCoord(out xx, out yy, out zz);
    }
    else if (dim == 1)
    {
        IVertexSegment_DG iEdge = iSurfPoint.GetElement() as IVertexSegment_DG;
        IVertex_DG iVertex = iEdge.GetEnd(0);
        iVertex.GetVertexCoord(out xx, out yy, out zz);
    }
    else if (dim == 2)
    {
        ISimplex_DG iSimplex = iSurfPoint.GetElement() as ISimplex_DG;
        UInt64 pos = iSimplex.GetVertexPosition(0);
        IMesh_DG iMesh = (IMesh_DG)iEntity;
        iMesh.GetVertexCoord(pos, out xx, out yy, out zz);
    }
}

int GetElementDimension()

Returns the lowest dimension of the surface element where this point belongs to (incident).
It is 0 for BRep or mesh vertex, 1 for BRep or Mesh edge and 2 for BRep face or mesh simplex.

string GetElementType()

This method is a shortcut for GetElementType1(GetElementDimension())

string GetElementType1(int dim)

Returns name of the interface returned by the GetElement():

If GetEntity().GetGeometryType() returns "BRep", this method returns:
"IBRepVertex_DG" if dim = 0
"IBRepEdge_DG" if dim = 1
"IBRepFace_DG" if dim = 2

If GetEntity().GetGeometryType() returns "Mesh", this method returns:
"IVertex_DG" if dim = 0
"IEdge_DG" if dim = 1
"ISimplex_DG" if dim = 2

Object GetParentElement(int dim)

Not implemented in this release

int GetParentElementCount(int dim)

Not implemented in this release

int GetNormalCount()

Returns 1 for faces or simplexes, 2 for edges or segments, 0 for vertices

VectDg GetNormal(int i)

Implemented for entities with "BRep" geometry type only in this release. The returned vector has coordinates relative to the local frame of the entity. Use GetEntity() > GetLocation() > ToGlobalVector() to convert to global.

int GetParameter(out DG2D uv)

Returns the parameter in uv. Returns GetElementDimension(). The return 1 means only the first component of uv (uv.x[0]) is valid.